Use more explicit CSS class names for boxes in configforms.
Review Request #5753 — Created April 29, 2014 and submitted
The configforms code now uses some better CSS class names for boxes. The
title of a box now uses "box-title", and is wrapped in a "box-head"
element. The main part is now "box-main".
This makes these easier to style without conflicting with existing
"main" and "title" classes.
Tested this along with a matching change in Review Board (on the My Account page).